Don't know what version of Hitman 2 I have.

[Jackets]

I want to get the silver to gold upgrade dlc, but it states that it only applies to owners of the silver edition. How is one to know what that is? I own Hitman 2 and all it's expansions, I own season 1 and all it's expansions. I do not own this new season beginning with the Bank Heist Mission, I think.

[Jet City Gambler]

If you had the silver edition, you'd have the bank heist. You most likely have the standard edition and need the expansion pass, which gets you the bank and resort maps, the 2 sniper maps, and a bunch of other stuff.

https://store.steampowered.com/app/957690/HITMAN2__Expansion_Pass/

[Kunovega]

Originally posted by Jackets:

I want to get the silver to gold upgrade dlc, but it states that it only applies to owners of the silver edition. How is one to know what that is? I own Hitman 2 and all it's expansions, I own season 1 and all it's expansions. I do not own this new season beginning with the Bank Heist Mission, I think.

Have you ever actually bought the game? Or have you been playing for free?

If you purchased any edition of the game, simply look at your steam account history and it will tell you exactly what you bought under view purchase history or view licenses, depending on which list you prefer to read through:
https://store.steampowered.com/account/

Game versions are explained here if you need it:
https://steamcommunity.com/sharedfiles/filedetails/?id=1580201161

[Liquidus Talon]

Originally posted by Jackets:

I want to get the silver to gold upgrade dlc, but it states that it only applies to owners of the silver edition. How is one to know what that is? I own Hitman 2 and all it's expansions, I own season 1 and all it's expansions. I do not own this new season beginning with the Bank Heist Mission, I think.

Go to your Steam Account Details section, and check if you have the license for Hitman 2 Silver Edition.

Maximise Steam Window -> Click on Top Right extending menu with your name, next to the 3 symbols for minimise, maximise and exit -> This will extend a downwards menu, 'Account details' will be there. Click on it -> Click on "View licenses and product key activations" and press ctrl + f to bring up a search box. You can type 'Hitman 2' into the search box to quickly find the entry for it, and determine what type of Hitman 2 license you have.